This is in the limit string. This is the string of safty switches in the heater. (thermostat, highlimits, rollout switch and pressure switch) The pressure switch is the most common problem. If the water flow get's to be too little so the water inside the heater is going to overheat than this will shut the heater down. This can be caused if your heater by-pass is to far open and letting water go by the heater. The most common problem is clogged baskets or a dirty filter. Other than this you can follow the flow chart in your manuel to find the source of the problem but if it just started without obvious cause this would be my bet.
I hope this helped and good luck.

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The "PLT" error code means pilot failure. The lack of spark may or may not mean an ignitor problem.

The "PLT" code could come up because the main valve in the heater
was in the "off" position. No gas = no pilot.Also check clogged
pilot-burner orifices. The lack of spark can also have to do with water flow
issues (dirty filter, clogged basket, etc.), or it may be a problem with
the electronics of the heater.

After checking the above, a service call by an authorized tech may be necessary.